About text messages

To send and receive text messages, your wireless service provider must
set up your wireless service plan for text messaging. Depending on your
wireless service provider, this feature might not be supported.

Depending on the typing input language that you use to type your text
messages, your messages might display to your recipients differently than you
expect.

Depending on your wireless
service provider, you might also be able to send and
receive the following media files in text messages: .jpg, .gif, .wbmp, .midi,
.vcf (vCard),
.ics (iCalendar), .avi, .mpg, or .mov.

If you have more than one phone number associated with your
BlackBerry smartphone,
your smartphone sends text messages using the first phone number that appears in
the My Number field in the Phone application.